T-square guide for use in producing perspective drawings



Dec. 8, 1964 o. A. OLSON ETAL 3,159,918

T-SQUARE cums FOR USE IN PRODUCING PERSPECTIVE DRAWINGS Filed June 11, 1962 2 Sheets-Sheet 1 Fig. 3

A /NVENTOP$ 0504/? A. 01 s0/v DEAN M. Hus'ra/v MWZZWaR A TTORNEVS ,1 o. A. OLSON ETAL 3,159,918

T-SQUARE cums FOR use IN PRODUCING PERSPECTIVE DRAWINGS Filed June 11, 1962 2 Sheets-Sheet 2 luv/sump: OSCAR A. OLSON By Dan/v M Husra/v TTOR/VEHS United States Patent 3,159318 T-SQUARE 'GUZEE FGR USE 1N PRQDUCING PERSPECT'EVE DRAWMGS Oscar A. Glson, 712 16th St, and Dean M. Huston, 14-22 Curtim Ave, both of Ames, Eowa Filed June 11, 1962, Ser. No. 201,364- 12 Claims. ill. 33-77) This invention relates to a combination T-square and guide means for use in producing drawings of perspective character.

Many drawings, character strokes, and like are required to be perspective showings. Herebefore the production of perspective views are usually accomplished by complicated measurements and plotting lines. Obviously this procedure is costly in time and money. Some eli'ort has been made to partially solve the problem by specially constructed instrument and/or tools. However, 'such equipment is expensive and requires maximum operating space area.

Therefore one of the principal objects of our invention is to provide a non-complicated combination guide and T-square for producing perspective drawings.

More specifically the object of this invention is to provide a simple adjustable guide means that will accommodate an ordinary T-square for producing perspective drawings.

A further object of this invention is to provide a T- square guide means for producing perspective drawings that is easily and accurately adjusted for producing perspective drawings of various degrees.

Still further objects of our invention are to provide a T-square guide for producing perspective drawings that is economical in manufacture, durable in use, and refined in appearance.

These and other objects will be apparent to those skilled in the art.

Our invention consists in the construction, arrangements and combination, of the various parts of the devices, whereby the objects contemplated are attained as hereinafter more fully set forth, specifically pointed out in our claims, and illustrated in the accompanying drawings, in which:

FIG. 1 is a plan View illustrating the use of our device for producing perspective drawings.

FIG. 2 is an enlarged perspective top view of our device.

FIG. 3 is an enlarged top plan view of the central area of our device and illustrates its adjustment prior to the production of a drawing in perspective.

FIG. 4 is an enlarged perspective exploded view of the parts that go to make up our T-square guide means, and

FIG. 5 is an enlarged longitudinal sectional view of the equipment taken on line 55 of FIG. 2, and more fully illustrates its construction.

As herebefore indicated, our device is relatively small, but it will produce, if desired, relatively large drawings in perspective.

The numeral designates the base of our T-square guide means. This base is in the form of an elongated rectangular sheet member and is adapted to rest on a drafting board 11, as shown in FIG. 1.

The numeral 12 designates the first movable arm. This arm is horizontally pivoted at its upper end by the pin 13 to the upper end portion of the base 10, as shown in FIG. 2.

The numeral 15 designates the second movable arm. This second arm is horizontally pivoted at its lower end to the lower end area of the base 16 by the pin 16. These two arms 12 and 15 have their free ends extending toward each other, but spaced apart as shown in FIG. 5.

The numeral 17 designates a link bar. This bar 17 has 3,159,918 Patented Dec. 8, 1964 its upper end horizontally pivoted to the lower free end of the arm 12 by a pin 19. In the lower end portion of the link bar 17 is a longitudinal slot 29.

The numeral 21 designates a wing nutted bolt extendin through the upper end area of the second arm 15 and the slot 20. The pivoted ends area of both arms 12 and 15 is vertically thickened to provide a space area 22 between the major lengths of the arms and the base 10, as shown in FIG. 5.

Slidably detachable extending in this. space area 22 is the longitudinal length portion 23 of a T-square. The numeral 25 designates the cross head on the T-square. This cross head 25 is adapted to slidably engage the right side edge of the arm 12 and arm 15.

On the base 10 is an arcuate scale 26 having its axis on the pin 13. Directly below the zero reading of the scale is a line 27 extending transversely of the longitudinal length of the base 10.

The practical operation of the device is as follows:

With the base 10 fixed on the drawing board 11, the T-square 'has its longitudinal length placed under the pivoted arm or arms. The wing nut, of the bolt 21 is in loosened condition so that the arm 12 may be swung to the left or to the right. The distance between the varnishing point 29 and point 30 is determined. A scale is chosen for the large perspective drawing. The distance between the varnishing point and the back edges of the arms (when the arms are in vertical positions) is determined. A table may be used to determine this lastdistance relative to the arcuate scale 26. As an illustration, if the arcuate degree is of a value 3 on the scale, the

' arm 12 is placed so that its right side edge reads on this number. Next the T-square is placed to have its 1ongitudinal top edge on and parallel with the line 27 as shown in FIG. 3.

The T-square is slid to the left until its cross-head engages the right side of the arm 12. Next, the arm 15 is moved to the right until it engages the T-square cross-head. At this time the arms 12 and 15 are locked against accidental movement by tightening the wing nut of the bolt.

The point 31 will be the left vanishing point.

By sliding the cross-head of the T-square upwardly and downwardly on the right side edges of the arms. 12 and 15, as shown in FIG. 1, the perspective drawing 32 may easily be made by using a marking instrument along the T-square.

The procedure may be reversed for perspective drawings located to the right. If desired a T-square may be used having a longitudinal length extending in both directions from its cross-headportion.

From the above it will be appreciated that our device may be used for making larger perspective drawings on a small drafting table, and/ or where one of the vanishing points is oil the drafting table.

Some changes may be made in the construction and arrangement of our T-square guide for use in producing perspective drawings without departing from the real spirit and purpose of our invention, and it is our intention to cover by our claims, any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope.

We claim:

1. In a device for use in producing perspective drawings, comprising in combination,

a drafting board,

a base member having upper and lower ends secured to the top of said drafting board,

a first arm having its upper end pivoted to the upper J a said two arms being so positioned on said base member to permit their free ends to extend toward each other, said pivoted ends of said first and second arms being vertically thickened, said first and second arms having a substantial portion of their bottom side in aparallel spaced relationship I to the upper surface of said drafting board,

ings, comprising in combination,

a drafting board,

a base member having upper and lower ends secured to the top of said drafting board,

a first arm having its upper end pivoted to the upper end of said base member,

a second arm having its lower end pivoted to the lower end of said base member.

said two arms being so positioned on said base member to permit their free ends to extend toward each other;

said pivoted ends of said first and second arms being vertically thickened,

said first and second arms having a substantial portion of their bottom side in a parallel spaced relationship to the upper surface of said drafting board,

a T-square having a longitudinal portion and a cross portion, with its longitudinal portion slidably movable under said first and second arms inwardly from said vertically thickened pivoted ends, and its cross portion capable of slidably engaging the side edges of said first and second arms,

a link pivoted at one end to the free end of said first arm,.

a slot opening in the other end of said link,

and a bolt means extending through the free end of said second arm and slidable in and through said slot opening.

3. In a device for use in producing perspective drawings, comprising in combination,

a drafting board, I a base member having upper and lower ends secured to the top of said drafting board,

a first arm having its upper end pivoted tothe upper 1 end of said base member,

a second arm having itslower end pivoted to the lower end of said base member,

said two arms being so positioned on said base member to permit their free ends to extend toward each other,

said pivoted ends of said first and second arms being vertically thickened,

said first and second arms having a substantial portion of their bottom side in a parallel spaced relationship to the upper surface of said drafting board,

a T-square having a longitudinal portion and a cross portion, with its longitudinal portion slidably movable under said first and second arms inwardly from said vertically thickened pivoted ends, and its cross portion capable of slidably engaging the side edges of said first and second arms,

a means for detachably locking said first and second arms in various positions of their swinging movement,

and an arcuate scale on said base member having its axis at the pivot point of said firstvarm and being valve indicated by said first arm.

ings, comprising in combination,

a drafting board,

a base member having upper and lower ends secured to the top of said drafting board,

a first arm having its upper end pivoted to the upper end of said base member,

a second arm having its lower end pivoted to the lower end of said base member,

said two arms being so positioned on said base member to permit their free ends to extend toward each other,

said pivoted ends of said first and second arms being vertically thickened,

said first and second arms having a substantial portion of their bottom side in a parallel spaced relationship to the upper surface of said drafting board,

a T-square having a longitudinal portion and a cross portion, with its longitudinal portion slidably movable under said first and second arms inwardly from said vertically thickened pivoted ends, and its cross portion capable of slidably engaging the side edges of said first and second arms,

a means for detachably locking said first and second arms in various positions of their swinging movement,

and a marker line on and extending transversely of said base member.

5. In a device for use in producing perspective drawings, comprising in combination,

said pivoted ends of said first and second arms being vertically thickened,

said first and second arms having a substantial portion of their bottom side in a parallel spaced relationship to the upper surface of said drafting board,

a Tsquare having a longitudinal portion and a crossportion, with its longitudinal portion slidably movable under said first and second arms inwardly-from said vertically thickened pivoted ends, and its cross portion capable of slidably engaging the side edges of said first and second arms,

a means for detachably locking said first and second arms in various positions of their swinging movement,

an arcuate scale on said base member having its axis at the pivot point of said first arm and being value indicated by said first arm,

and a marker line on and extending transversely of said base member adjacent said arcuate scale.

6. In a device for use in producing perspective drawmgs, comprising in combination,

tion of their bottom side in a parallel spaced relationship to the upper surface of said drafing board,

a T-square having a longitudinal portion and a cross portion, with its longitudinal portion slidably movable under said-first and second arms inwardly from said vertically thickened pivoted ends, and its cross portion capable of slidablyengaging the side edges of said first and second arms,

a link pivoted at one end to the free end of said first arm,

a slot opening in the other end of said link,

a bolt means extending through the free end of said second arm and slidable in and through said slot opening.

an arcuate scale on said base member having its axis at the pivot point of said first arm and being value indicated by said first arm,

and a marker line on and extending transversely of said base member adjacent said arcuate scale.

7. In a device for use in producing perspective drawings, comprising in combination,

a base member having upper and lower ends,

a first arm having its upper end pivoted to the upper end of said base member,

a second arm having its lower end pivoted to the lower end of said base member,

said two arms being so positioned on said base member to permit their free ends to extend toward each other,

said pivoted ends of said first and second arms being vertically thickened,

said first and second arms having a substantial portion of their bottom side'in a parallel spaced relationship to the upper surface of said base member, a T-square having a longitudinal portion and a cross portion, with its longitudinal portion slidably movable under said first and second arms inwardly from said vertically thickened pivoted ends, and its cross portion capable of slidably engaging the side edges of said arms, and a means for detachably locking said first and second arms in various positions of their swinging movement. 8. In a device for use in producing perspective drawings, comprising in combination,

a base member having upper and lower ends, a first arm having its upper end pivoted to the upper end of said base member, a second arm having its lower end pivoted to the lowe end of said base member, said two arms being so positioned on said base member to permit their free ends to extend toward each other, said pivoted ends of said first and second arms being vertically thickened, said first and second arms having a substantial portion of their bottom side in a parallel spaced relationship to the upper surface of said base member, a T-square having a longitudinal portion and a cross portion, with its longitudinal portion slidably movable under said first and second arms inwardly from said vertically thickened pivoted ends, and its cross portion capable of slidably engaging the side edges of said arms, a link pivoted at one end to the free end of said first arm, i a slot opening in the other end of said link, and a bolt means extending through the free end of said second arm and slidable in and through said slot opening. 9. In a device for use in producing perspective drawings, comprising in combination,

a base member having upper and lower ends, a first arm having its upper end pivoted to the upper end of said base member,

a second arm having its lower end pivoted to the lower end of said base member,

said two arms being so positioned on said, base member to permit their free ends to extend toward each other,

said pivoted ends of said first and second arms being vertically thickened,

said first and second arms havinga substantial portion of their bottom side in a parallel spaced relationship to the upper surface of said base member,

a T-square having a longitudinal portion and a cross portion, with its longitudinal portion slidably movable under said first and second arms inwardly from said vertically thickened pivoted ends, and its cross portion capable of slidably engaging the side edges of said arms,

a means for detachably locking said first and second arms in various positions of their swinging movement,

and an 'arcuate scale on said base member having its axis at the pivot point of said first arm and being value indicated by said first arm; v e

10. In a device for use in producing perspective drawings, comprising in combination,

a base member having upper and lower ends,

a first arm having its upper end pivoted to the upper end of said base member,

a second arm having its lower end pivoted to the lower end of said base member,

said two arms being so positioned on said base member to permit their free ends to extend toward each other,

said pivoted ends of said first and second ar-rns being vertically thickened,

said first and second arms having a substantial portion of their bottom side in a parallel spaced relationship to the upper surface of said base member,

a T-square having a longitudinal portion and a cross portion, with its longitudinal portion slidably movable under said first and second arms inwardly from said vertically thickened pivoted ends, and its cross portion capable of slidably engaging the side edges of said arms,

a means for detachably locking said first and second arms in various positions of their swinging movement,

and a marker line on and extending transversely of said base member. a

11. In a device for use in producing perspective drawings, comprising in combination,

a base member having upper and lower ends,

a first arm having its upper end pivoted to the upper end of said base member,

a second arm having its lower end pivoted .to the lower end of said base member,

said two arms being so positioned on said base member to permit their free ends to extend toward each other,

said pivoted ends of said first and second arms being vertically thickened,

said first and second arms having a substantial portion of their bottom side in a parallel spaced relationship to the upper surface of said base member,

a T-square having a longitudinal portion and a cross portion, with its longitudinal portion slidably movable under said first and second arms inwardly from said vertically thickened pivoted ends, and its cross portion capable of slidably engaging the side edges of said arms,

a means for detachably locking said first and second arms in various positions of their swinging movement,

an arcuate scale on said base member having its axis at the pivot point of said first arm and being valve indicated by said first arm,

and a marker line on and extending transversely of said base member adjacent said arcuate scale.

12. In a device for use in producing perspective drawings, comprising in combination,

*a base member having upper and lower ends,

a first arm having its upper end pivoted to the upper end of said base member,

a second arm having its lower end pivoted to the lower end of said base member,

saidtwo arms being so positioned on said base member, to permit their free ends to extend toward each other,

said pivoted ends of said first and second arms being vertically thickened,

said first and second arms having a substantial portion of their bottom side in a parallel spaced relationship to the upperv surface of said base member,

'a T-square having a longitudinal portion and a cross portion, with its longitudinal portion slidably movable under said first and second arms inwardly from said vertically thickened pivoted ends, and its cross References Cited by theExaminer UNITED STATES PATENTS 1,122,533 12/14 Ogilvie 3377 1,497,136 6/24 Douma et a1. 33-94 X FOREIGN PATENTS 33,255 6/ 08 Austria.

ISAAC LISANN, Primary Examiner. 

1. IN A DEVICE FOR USE IN PRODUCING PERSPECTIVE DRAWINGS, COMPRISING IN COMBINATION, A DRAFTING BOARD, A BASE MEMBER HAVING UPPER AND LOWER ENDS SECURED TO THE TOP OF SAID DRAFTING BOARD, A FIRST ARM HAVING ITS UPPER END PIVOTED TO THE UPPER END OF SAID BASE MEMBER, A SECOND ARM HAVING ITS LOWER END PIVOTED TO THE LOWER END OF SAID BASE MEMBER SAID TWO ARMS BEING SO POSITIONED ON SAID BASE MEMBER TO PERMIT THEIR FREE ENDS TO EXTEND TOWARD EACH OTHER, SAID PIVOTED ENDS OF SAID FIRST AND SECOND ARMS BEING VERTICALLY THICKENED, SAID FIRST AND SECOND ARMS HAVING A SUBSTANTIAL PORTION OF THEIR BOTTOM SIDE IN A PARALLEL SPACED RELATIONSHIP TO THE UPPER SURFACE OF SAID DRAFTING BOARD, A T-SQUARE HAVING A LONGITUDINAL PORTION AND A CROSS PORTION, WITH ITS LONGITUDINAL PORTION SLIDABLY MOVABLE UNDER SAID FIRST AND SECOND ARMS INWARDLY FROM SAID VERTICALLY THICKENED PIVOTED ENDS, AND ITS CROSS PORTION CAPABLE OF SLIDABLY ENGAGING THE SIDE EDGES OF SAID FIRST AND SECOND ARMS, AND A MEANS FOR DETACHABLY LOCKING SAID FIRST AND SECOND ARMS IN VARIOUS POSITIONS OF THEIR SWINGING MOVEMENT. 